Bioscience, Biotechnology, and Biochemistry
Online ISSN : 1347-6947
Print ISSN : 0916-8451
Biochemistry & Molecular Biology Notes
Increases in 1,5-Anhydroglucitol Levels in Germinating Amaranth Seeds and in Ripening Banana
Yotaro KONISHIKeiko HASHIMAKunihiro KISHIDA
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2000 Volume 64 Issue 11 Pages 2462-2465

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Abstract

  To examine whether 1,5-anhydroglucitol (AG) is derived from starch degradation in plant tissues, we colorimetrically measured AG contents of germinating amaranth seeds and ripening banana pulp. In both cases, as starch degradation proceeded, AG levels were significantly increased, but were 1,700-5,000 times lower than those of total soluble carbohydrates. α-1,4-Glucan lyase activity, which is measured by the 1,5- anhydrofructose (AF) liberated from non-reducing glucose residues of starch or glycogen, was too low to be detected in amaranth or banana by the 3,5-dinitrosalicylic acid method. On the other hand, AF reductase, which reduces AF to AG, was detected in germinating amaranth seeds and banana pulp. Thus, the increases in AG levels are conceived to be derived from starch breakdown, although further investigation is needed to answer whether the starch degradation pathway via α-1,4-glucan lyase/AF reductase exists in plant tissues.

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© 2000 by Japan Society for Bioscience, Biotechnology, and Agrochemistry
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